Timeline addition: Display cached frames

This started off doing pointcache debugging but it's also very useful for users too.
Previously it was very hard to see the state of the system when you're working caches
such as physics point cache - is it baked? which frames are cached? is it out of date?

Now, for better feedback, cached frames are drawn for the active object at the bottom 
of the timeline - a semitransparent area shows the entire cache extents, and more 
solid blocks on top show the frames that are cached. Darker versions indicate it's 
using a disk cache.

It can be disabled in general in the timeline View -> Caches menu, or by each individual
system that can be shown.

There's still a bit to do on this, behaviour needs to be clarified still eg. deciding what
shows when it's out of date, or when it's been played back but not cached, etc. etc. 
Part of this is due to a lack of definition in the point cache system itself, so we should
try and clean up/clarify this behaviour and what it means to users, at the same time.

Also would be interested in extending this to other caches such as fluid cache, 
sequencer memory cache etc. in the future, too.

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index e59cad09d6c..ba9d0380c9f 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -346,6 +346,17 @@ typedef struct SpaceScript {
 	void *but_refs;
 } SpaceScript;
 
+typedef struct SpaceTimeCache {
+	struct SpaceTimeCache *next, *prev;
+	int type;
+	int flag;
+	
+	float *array;
+	int len;
+	int startframe, endframe;
+	int ok;
+} SpaceTimeCache;
+
 typedef struct SpaceTime {
 	SpaceLink *next, *prev;
 	ListBase regionbase;		/* storage of regions for inactive spaces */
@@ -354,6 +365,9 @@ typedef struct SpaceTime {
 	
 	View2D v2d; /* deprecated, copied to region */
 	
+	ListBase caches;
+	int cache_display, pad;
+	
 	int flag, redraws;
 	
 } SpaceTime;
@@ -860,6 +874,13 @@ enum {
 #define TIME_CONTINUE_PHYSICS	128
 #define TIME_NODES				256
 
+/* time->cache */
+#define TIME_CACHE_DISPLAY		1
+#define TIME_CACHE_SOFTBODY		2
+#define TIME_CACHE_PARTICLES	4
+#define TIME_CACHE_CLOTH		8
+#define TIME_CACHE_SMOKE		16
+
 /* sseq->mainb */
 #define SEQ_DRAW_SEQUENCE         0
 #define SEQ_DRAW_IMG_IMBUF        1